CCNP ROUTE Study – EIGRP Offset Lists

In certain situations an engineer may need to manipulate EIGRP metrics, and one method is to use Offset Lists to increase both the AD (Advertised Distance) and FD (Feasible Distance) of a route by a certain value – the offset.

Offset List configurations define the following:

route(s) that we want to amend the metric for (matching an ACL)

direction of the updates being sent or received

interface on which updates are sent or received

offset integer value

Network diagram:

Objective One:

when router WEST advertises prefix 10.1.1.0 out of interface Serial0/0, it should add 100 to the metric

Lets first check the FD and AD values that HQ has in its topology table for prefix 10.1.1.0/24:

About Rich Bibby

Rich Bibby is a UK based Network Engineer, working mainly with Cisco, Juniper and Arista gear in the enterprise LAN, WAN and Data Centre space. Aside from route/switch/firewalling, he is interested in open source network monitoring and management tools, and exploring the possibilities that automation and programmability bring to networking.
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2 thoughts on “CCNP ROUTE Study – EIGRP Offset Lists”

What’s the IOS version you are using? I have seen different behaviors when it comes to offset-list inbound.
For example:
c7200-advipservicesk9-mz.150-1.M would incremet the metric by the offset both for FD and RD as your example.
However,
c7200-adventerprisek9-mz.152-4.M8 would not. When you apply the offset-list inbound It would only increse the FS but not the RD.
That’s weird behaivor and I have not found any documentation on that.